linux-kernel - Re: [PATCH V4] arm64: amd-seattle: Adding device tree for AMD Seattle platform

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Date:	Thu, 27 Nov 2014 14:28:11 +0000
From:	Liviu Dudau <Liviu.Dudau@....com>
To:	"Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>
Cc:	Marc Zyngier <Marc.Zyngier@....com>,
	"arnd@...db.de" <arnd@...db.de>,
	Mark Rutland <Mark.Rutland@....com>,
	Will Deacon <Will.Deacon@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"robherring2@...il.com" <robherring2@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"arm@...nel.org" <arm@...nel.org>,
	"Lendacky, Thomas" <Thomas.Lendacky@....com>,
	"Schopp, Joel" <Joel.Schopp@....com>
Subject: Re: [PATCH V4] arm64: amd-seattle: Adding device tree for AMD
 Seattle platform

On Tue, Nov 25, 2014 at 11:46:50AM +0000, Suthikulpanit, Suravee wrote:
> Hi Marc,
> 
> On 11/25/14, 17:23, "Marc Zyngier" <marc.zyngier@....com> wrote:
> 
> >Hi Suravee,
> >
> >Just spotted a small issue below (looks like a recurring mistake in a
> >number of DTs I've seem lately):
> >
> >On 24/11/14 21:51, suravee.suthikulpanit@....com wrote:
> >> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> >> 
> >> Initial revision of device tree for AMD Seattle platform.
> >> 
> >> Cc: Arnd Bergmann <arnd@...db.de>
> >> Cc: Marc Zyngier <marc.zyngier@....com>
> >> Cc: Mark Rutland <mark.rutland@....com>
> >> Cc: Will Deacon <will.deacon@....com>
> >> Cc: Catalin Marinas <catalin.marinas@....com>
> >> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> >> Signed-off-by: Thomas Lendacky <Thomas.Lendacky@....com>
> >> Signed-off-by: Joel Schopp <Joel.Schopp@....com>
> >> ---
> >> V4 Changes:
> >>     * Remove unnecessary smb layer and move motherbord to top level
> >>     * Move include dtsi to top level
> >>     * Remove apb_pclk from sata0 and i2c
> >>     * Fix GIC Virtual Maintanance Interrupt from PPI24 (8) to PPI25 (9)
> >>     * Add 40-bit dma-ranges for motherboard (simple-bus)
> >>     * Remove dma0 (pl330) entry for now since it only supports 32-bit
> >>DMA.
> >>       It is basically not used at the moment. It would also need SMMU
> >>       to allow dma remapping to 40-bit DMA range.
> >>     * Add phandle spi0 and spi1
> >>     * Hook up gpio0 pin 7 with MMC Card Detection (CD) support.
> >>     * Changes in pcie0 entry:
> >>         - Add 40-bit dma-ranges
> >>         - Remove interrupts property
> >>         - Add interrupt-map/mask property
> >>         - Fix PCI I/O range
> >>         - Merge PCI 32-bit ranges
> >>         - Merge PCI 64-bit ranges
> >> 
> >> NOTE: I am not add a new compatible ID for the sata0 as Rob Herring
> >>       suggested since there is no need at the momement, and I am trying
> >>       to avoid introducing ID unnecessarily.
> >> 
> >>  arch/arm64/Kconfig                          |   5 +
> >>  arch/arm64/boot/dts/Makefile                |   1 +
> >>  arch/arm64/boot/dts/amd-seattle-periph.dtsi | 156
> >>++++++++++++++++++++++++++++
> >>  arch/arm64/boot/dts/amd-seattle.dts         |  89 ++++++++++++++++
> >>  4 files changed, 251 insertions(+)
> >>  create mode 100644 arch/arm64/boot/dts/amd-seattle-periph.dtsi
> >>  create mode 100644 arch/arm64/boot/dts/amd-seattle.dts
> >> 
> >
> >[...]
> >
> >> diff --git a/arch/arm64/boot/dts/amd-seattle.dts
> >>b/arch/arm64/boot/dts/amd-seattle.dts
> >> new file mode 100644
> >> index 0000000..d5fc482
> >> --- /dev/null
> >> +++ b/arch/arm64/boot/dts/amd-seattle.dts
> >> @@ -0,0 +1,89 @@
> >> +/*
> >> + * DTS file for AMD Seattle
> >> + *
> >> + * Copyright (C) 2014 Advanced Micro Devices, Inc.
> >> + */
> >> +
> >> +/dts-v1/;
> >> +
> 
> [...] 
> 
> >> +
> >> +	timer {
> >> +		compatible = "arm,armv8-timer";
> >> +		interrupts = <1 13 0xff01>,
> >> +			     <1 14 0xff01>,
> >> +			     <1 11 0xff01>,
> >> +			     <1 10 0xff01>;
> >> +	};
> >
> >The Cortex-A57 TRM clearly states that these interrupts are level
> >triggered.
> 
> Thanks for pointing this out. I¹ll fix this to <1 1X 0xff04> (4 for the
> Active-High) then.

Hi Suravee,

Don't know what Seattle does, but the TRM says that the outputs are active-LOW.

Best regards,
Liviu

> 
> Suravee
> 
> >
> 
> 

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
  ---------------
    ¯\_(ツ)_/¯

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